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Many diseases in humans are directly or indirectly caused by improper eating habits and malnutrition. These include, but are not limited to, nutritional deficiency diseases, caused by a lack of essential nutrients. These can be associated with poor cognitive performance and other symptoms of interest to psychologists

Additionally, some mental disorders are directly or indirectly linked to nutritional deficiencies]]. These include:-

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Vitamins

Refers to a condition of overly high storage levels of vitamins, which can lead to toxic symptoms. The medical names of the different conditions are derived from the vitamin involved: an excess of vitamin A, for example, is called "hypervitaminosis A".